Equipment to prepare ore concentrate for pelletizing

Abstract

The invention relates to an equipment to prepare ore concentrate for pelletizing and sintering/indurating of pellets in ferroalloys production. The equipment comprises a grinder ( 1 ) arranged to grind the concentrate to a predetermined grain size. The equipment further comprises a drying apparatus ( 2, 3, 4 ) arranged to dry the concentrate before and/or during grinding by the grinder ( 1 ).

1 . A device to prepare ore concentrate for pelletizing and sintering/indurating of pellets in ferroalloys production, the device comprising a grinder arranged to grind the concentrate to a predetermined grain size, and a drying apparatus arranged to dry the concentrate at least one of before and during grinding by the grinder. 
     
     
         2 . The device according to  claim 1 , where the drying apparatus is arranged to dry ore concentrate by the heat energy obtained from burning carbon monoxide. 
     
     
         3 . The device according to  claim 2 , where the drying apparatus is arranged to dry ore concentrate by the heat energy obtained from burning carbon monoxide rich off-gas from a smelting furnace. 
     
     
         4 . The device according to  claim 3 , where the drying apparatus comprises
 a burning chamber comprising a burner arranged to burn carbon monoxide and/or carbon monoxide rich off-gas to produce hot gases, and   a drying chamber arranged to dry ore concentrate with said hot gases.   
     
     
         5 . The device according to  claim 4 , where the grinder comprises a grinding chamber arranged to grind the ore concentrate during conveyance the ore concentrate through the grinding chamber; and where the grinding chamber and the drying chamber are built together, so that hot gases from a separate burning chamber are led to the grinding chamber. 
     
     
         6 . The device according to  claim 4 , where the burning chamber, the drying chamber and the grinding chamber are built together so that the burner producing hot gases is attached directly to the grinder. 
     
     
         7 . The device according to  claim 1 , where the drying apparatus comprises
 a burning chamber comprising a burner arranged to burn carbon monoxide and/or carbon monoxide rich off-gas to produce hot gases, and   a drying chamber arranged to dry ore concentrate with said hot gases.   
     
     
         8 . The device according to  claim 7 , where the grinder comprises a grinding chamber arranged to grind the ore concentrate during conveyance the ore concentrate through the grinding chamber; and where the grinding chamber and the drying chamber are built together, so that hot gases from a separate burning chamber are led to the grinding chamber. 
     
     
         9 . The device according to  claim 7 , where the burning chamber, the drying chamber and the grinding chamber are built together so that the burner producing hot gases is attached directly to the grinder.